0A to 2A Current Source - The LT1995 amplifies the sense resistor drop by 5V/V and subtracts that from VIN,
providing an error signal to an LT1880 integrator. The integrated error drives the PMOSFET as required to
deliver the commanded current. . . . [Linear Technology App Note, Mar 31, 2010]

1.3W VHF RF Amplifier
2SC1970 88-108 MHz - This RF power amplifier is
based on the transistor 2SC1970 and 2N4427. The output power is about 1. 3W and the input driving power
is 30-50mW. It will still get your RF signal quit far and I advice you to use a good 50 ohm resistor as
dummy load. To tune this amplifier you can either use a power meter/wattmeter, SWR unit or you can do
using a RF field meter. . . . [Designer's name not included]

20W VHF Linear Amplifier 2SC1946 50 MHz - This VHF linear amplifier works for 50 MHz frequency using 2SC1946A with
power output about 20 Watt. It needs input 30mW and output 25W for 150 Mhz. It seems can be used for 144 Mhz
without modification. There are Power IC and 2SC1946A with low-pass filter on the board. . . . [by JO1ACW,
June 3, 2002]

30 Watt VHF Amplifier - The 30 watt amplifier schematic shown below provides an appropriate power boost with an
input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the
circuit is very stable at my place and provides a clean-output through seven (7) element Butter-worth
low-pass filter. . . [Circuit designed by David Celestin]

Balanced Frequency Converter (Suitable for
Frequencies up to 50kHz) - This circuit takes
advantage of aliasing that occurs in any time sampled system. The output signal frequency is the difference
in frequency between the input signal and the switch sampling rate. A 24KHz input signal sampled at 25KHz
will be converted to a 1KHz output signal. In addition by using the LTC1992 fully differential . . . [Linear
Technology App Note, Mar 16th 2010]

Full-Bridge Load Current Monitor - The LT1990 is a micropower precision difference amplifier with a very high common mode
input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V common mode
voltage range on a ±15V supply. The inputs are fault protected from common mode voltage transients up to
±350V and differential voltages . . . [Linear Technology App Note, Apr 5th 2010]

Low Noise AC Amplifier with Programmable Gain and
Bandwidth - Two LTC6910 programmable gain amplifiers
can be combined to provide independent gain and bandwidth control using two 3 bit digital words. The Gain
Control PGA simply varies the circuit gain from 1 to 100. The Bandwidth Control PGA puts signal gain inside
the feedback loop of the amplifier. As this gain is increased the effective value of feedback resistor R2 is
decreased. This pushes out the upper low pass corner frequency of the ac amplifier. . . . [Linear Technology
App Note, Mar 16th 2010]

Single Supply Video Line Driver (AC Coupled) - When AC-coupling video, the waveform dynamics change with respect to the bias point of the
amplifi er according to the scene brightness of the video stream. In the worst case, 1VP-P video (composite
or Luminance + Sync in Y/C or YPBPR format) can exhibit a varying DC content of 0. 56V, with the dynamic
requirement being . . . [Linear Technology App Note, Mar 25th 2010]

VHF/UHF Prescaler - The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner
prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available both new and
in the surplus market at much lower prices than conventional divide by 10 prescalers. . . .

VHF/UHF TV Modulator - Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is
modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial
input via a cable. Then all that remains to do is tune the TV to the correct frequency. . . .